Burglar-alarm.



S. MILANU.

BURGLAR ALARM.

APPLICATION FILED DEC. 2?. 1912. 1,163,164, Patented Dec. 7, 1915.

INVENTOR WITNESSES.- I

fiilvasfr'o milano.

BY I Whiz/1d A ilomeys SILVES'I'ROMILANO, or NEW Yonx, N. Y.

, BURGLAR ALARM.

To all 107mm it may concern: I

Be it known that I, SILvns'rRo MILANO, a citizen of the United States, residing in the city of New York, borough of Bronx, county and State of New York, have invented a certain new and useful Burglar- Alarm, of which the following is a specification. i r

This invention is a burglar alarm, the same being adapted for use on a door or a window for the purpose ofautomatically giving'an alarm when an attempt is made to, open the door or window. e

The invention consists of a base having means for holding a cartridge, a plunger supported on the base for slidable'and rotative movementthereon, a spring for operating the plunger, means for retainlng the plunger in a retracted position, and a trip member movable with the plunger. Saidtrip member is pivoted t'o'the plunger,

' whereby said trip is adapted to be folded to assume an out of'service position whenthe alarm is not to be used, such adjustment being effected while the plunger is in a retracted position, but when the alarm is to be set for use, then the trip member should be positioned at an angle to the plunger, whereupon the trip member is locked to'the plunger by the adjustment of a locking member, preferably in the form of a slidable sleeve.

In the accompanying drawings," I have illustrated different practical embodiments of the invention, but the constructions shown therein are to be understood as illustrative, only,and not as defining the limits of the invention.

Figure 1 is a front elevation of my device applied to the casing and a door, the alarm device being illustrated for the trip member thereof to lie in the path of the door, said door and the casing being indicated in v dotted lines. 'Fig. 2 is a front elevationof the alarm device with the trip member in a folded inoperative position. Fig. dis a side elevation illustrating the plunger in the porails of window sashes.

The burglar alarm illustrated in Figs. 1,

I Specification of Letters Patent. Applicatibnfiled December 27,1912. Serial No. 738,839.

Patented Dec. 7,1915.

2-and 3 is especiallyad'apted for use on the casing G of a door G, theparts being illustrated in dotted lines in F ig. '1.

The working. parts of the device are mounted on a base member A, the latter being provided near its respective end portions with apertures a adapted'to receive screws by which the base member is fastened firmly in place on the door casing G.

'Near one end the base member is provided with a'lug B adapted to receive a cartridge Z), to be exploded by the movement of a plunger'C. The lug B may be constructed. in any suitable way toreceive the cartridge;

jordinarily it is suificient to provide the lug with a recess within which the cartridge Z) is adapted to be inserted by hand. It is apparent that the cartridge should be positioned in thepath of movement of the plunger C in order that the impact of the plunger may explode the cartridge. Ordinarily, a blank cartridge isused The plunger C is fitted loosely in lugs c c, "the latter being integral with the base member. Said plunthe movement of the plunger in one direc-' tion is due to the action on said plunger of a coiled springD, whereby the plungerwhen tripped is impelled'with considerable force toward and into contact with the cartridge for the purpose of exploding the latter and givingthe desired alarm. In addition to the guide lugs c, the base member is provided with a pair of locking lugs a between which the end portion of the plunger is slidable, said plunger being rotatable between the lugs a a in order that the bent end (1 of the plunger may have locking engagement with one lug or the other (6, whereby the spring D," whereby the spring acts through the washer and the nut to exert'its expansive force agalnst'the plunger C so as to impel the latter forciblytoward the cartridge, it being observed thatlsaid spring withrespect to the plunger arm C.v

endproduce a short arm- C, the latter extending at a right angle to the length'of the plunger. This short'armisprovided with a notch in which is fitted an end portion'of'a trip member E, said trip member" being pivoted to the short arm C by'a transverse pin 6. I The pivoted portion of the trip member E is beveled at e, andwhen,

the trip member is moved into alinement With; the arm C sai'dbeveledend 6 of the .trip'member is in contact with an end face of the recess in the arm G, thus limiting the pivotal movement of the trip member The trip member is. locked in fixed relation to the-armof the plunger by allocking sleeve .F,'the latter being slidably fitted onthe theplunger, but when the deviceis set for. .serviceand it is desired to position the'trip Vmember out of the way of the door, then the sleeve-F is Withdrawn'from the pivotal pine and the member E 'is'tu'rned to a position parallel with the plunger Chas-clearly shownin Fig.2, The spring D" and lugs'c c'- are incased withina suitable housing A, the latter being fittedremovably to the base memb'erA.

For the sake of ,clearnessthe casing A is omittedfrom Fig. 1,. but the position of this casing A. is indicated in Figs. 2and8;

I In addition to the alarm, my invention embodies a safety chain adapted to be used in connection with the doorand the base member 'so' as to prevent the door from being forced open by an intruder after the alarm is given. The safety chain is combined with the base member A in such a manner that the attachment ofthe safety 7 .chain tothe base. member does notain any way interfere with the operation of the alarm mechanism. 1 Accordingly, the base member is provided at one end and at a pointremote to the plunger with a fixed.

. staple or lug H, to which stapleis loosely connected an'end link of the safety chain At the free endof this safety chain there is provided a fastening member in the form of a plate It having a headed stud h,

' the stud projecting laterally from the plate band formed with'a recess 71 between the head. and the plate. .The safety chain is used in connection with a keeper I, consisting of. a base plate provided with'apertures i. for the,.-passage of screws, whereby the keeper is fastened rigidly'to the door G.

V This keeper is provided with a slot, one end of which isenlarged 'atl. The. fastening memberh is adapted for engagementwith thc'keeperwhen'it desired to set the alarm 'and'se'cure' thedoor, the head it of the fasfte'ning member'- being insertible into the enlarged end of the slot and slidable into the smaller part of the slot so asto-deta'chably the keeper onthe door. V I p 1 The-operation-isas follows: Thev base member is fastened'by screws to'the door casing and the keeper I" is'secured in like manner to the door. hen it is desired to set the alarm for use the' operator withdraws plunger' 'C- so as to compress-the .springvD and turns the plunger for the arm .0 to engage one of the lugs a, thus locking the plunger in a retracted position and under the tension of the spring. The operator should now insert a cartridge Z) ("fasten the free end of the safety chain to p into the 'lug'B and thereafter the trip mem- C ber E is turned on the pivot 6' so as to extend across the door G, after which the sleeveF is moved along trip member E to inclose the pivotal connection-e and lockfthe member E to the plungerGm The safety chain is nowlifted and manipulated for its fastener-J1 to engage'with the slotted keeper 1. When pressure is applied to the door G the'arm E is pressed inwardand plunger C is-rotated, thus withdrawing the bent arm C from one of 'the"lug s,;whereupon the spring D impels the plunger toward the cartridge'for exploding the latter, therebygiving the audible alarm. The. door, however,

is not necessary to withdraw. the cartridge from the lug B or' to" release the plunger from the lug a with which saidplunger is engaged, for the reason that sleeve'F can be moved along the trip E, after which the trip canbe turned' into a' 'foldefd position parallel 'tothe plunger, as shown'inFig; 2. i The safety chain can be readily disconnected from the keeper and thus the entire device can be adJuSted so as to permit the door to be openedand closed without setting ofi the-alarm,orbreaking the safety chain.

My invention as thus far described is adapted to be used on a door and its jamb,

but in Fig. 4 there isillustrated a construct on of the alarm'which may be employed to good advantage on the meeting rails of window sashes. The device consists-of thebase member provided with the guide lugs 00 and thelocking lugs a, the recessedlug B to receive the cartridge, the spring-operated plunger, C, the trip member E pivoted to thebent arm of said plunger, andthelocking sleeve F, all of which parts are constructed and adapted for operation substantially'as hereinbefore described. Thewin- I cannot be opened, forthe, reason that the:

.chainH engaged with thekeeper, thus preventing a burglar from entering the room,' Should the alarm'remain intact, it

dowifastener, however, does not require the I safety chain or its keeper and, accordingly,

these parts are omitted The spring and a part of the casing A.

When it is desired to use the device of Fig. the base member is secured by screws plunger are housed within the to one of the sash rails and to adapt the device for use the plunger is pulled in one direction and turned so that the bent arm of the plunger engages with one of the lugs a, after which the pivoted arm E is turned to a position at right angles to the plunger and the sleeve F is adjusted so as to lock the trip to the plunger. It is apparent that the base member, the plunger and the cartridge are supported on a rail of one sash,

' what I claim as new, and desire to secure by Letters Patent is 1. In a burglar alarm, the combination with a base, of a plunger supported for sliding and rotative movement thereon, said plunger being provided with an angular arm, a trip member pivoted to said arm of the plunger, said trip member being foldable parallel to the plunger and being mov- Copies of this patent may be obtained for able on the pivot to extend in line with the arm of the plunger, and a sleeve for locking the trip member in fixed relation to the arm of said plunger when said trip member extends outwardly from the plunger. 2. In a burglar alarm, the combination with a base, and a spring-operated firing plunger-supported on the base for sliding and rotatlve movement thereon, of ,means lorloclnng said firlng plunger in a retracted position with the spring under tension, sai

lockingmeans being ,efiective in retaining 5 said plunger when it is rotated in one direction or the other from a central position, a

triggerhaving pivotal connection with said firing plunger, said trigger being foldable into an inoperative position substantially parallel to the plunger and being movable into an operative position substantially at right angles to, said plunger, and triggerlocking means cooperatingwith the plunger and the trigger, said trigger'locking means being effective in restraining the trigger from pivotal movement in any direction relative to the plunger when said trigger 1s in the operative position substantially at right angles to said plunger.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

. SILVESTRO MILANO.

Witnesses:

CoRNELIUsZABRIsKm, I M. C. RODRIGUEZ.

five cents each, by addressing the Commissioner of Patents, Washington, I). 0. I 

